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Stained glass made by medieval processes is being used by scientists designing a camera for a Mars rover to ensure it captures colours correctly.

Small blocks of coloured glass will be used to calibrate the images before they are beamed back to Earth. Unlike card or most materials used for colour charts, the glass will not fade.

Scientists were worried that the ultraviolet light is so intense on Mars that colours might fade in days. The team from Aberystwyth University realised, however, that medieval stained glass is still as bright and colourful as it was when it was created despite